HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| c4b681fd | 1 | /* vsprintf with automatic memory allocation. |
| 61cd9dc9 | 2 | Copyright (C) 2002-2004, 2007-2010 Free Software Foundation, Inc. |
| c4b681fd LC |
3 | |
| 4 | This program is free software; you can redistribute it and/or modify | |
| 5 | it under the terms of the GNU Lesser General Public License as published by | |
| 6 | the Free Software Foundation; either version 2, or (at your option) | |
| 7 | any later version. | |
| 8 | ||
| 9 | This program is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | GNU Lesser General Public License for more details. | |
| 13 | ||
| 14 | You should have received a copy of the GNU Lesser General Public License along | |
| 15 | with this program; if not, write to the Free Software Foundation, | |
| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 17 | ||
| 18 | #ifndef _VASNPRINTF_H | |
| 19 | #define _VASNPRINTF_H | |
| 20 | ||
| 21 | /* Get va_list. */ | |
| 22 | #include <stdarg.h> | |
| 23 | ||
| 24 | /* Get size_t. */ | |
| 25 | #include <stddef.h> | |
| 26 | ||
| 27 | #ifndef __attribute__ | |
| 61cd9dc9 LC |
28 | /* The __attribute__ feature is available in gcc versions 2.5 and later. |
| 29 | The __-protected variants of the attributes 'format' and 'printf' are | |
| 30 | accepted by gcc versions 2.6.4 (effectively 2.7) and later. | |
| 31 | We enable __attribute__ only if these are supported too, because | |
| 32 | gnulib and libintl do '#define printf __printf__' when they override | |
| 33 | the 'printf' function. */ | |
| c4b681fd | 34 | # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) |
| 61cd9dc9 | 35 | # define __attribute__(Spec) /* empty */ |
| c4b681fd LC |
36 | # endif |
| 37 | #endif | |
| 38 | ||
| 39 | #ifdef __cplusplus | |
| 40 | extern "C" { | |
| 41 | #endif | |
| 42 | ||
| 43 | /* Write formatted output to a string dynamically allocated with malloc(). | |
| 44 | You can pass a preallocated buffer for the result in RESULTBUF and its | |
| 45 | size in *LENGTHP; otherwise you pass RESULTBUF = NULL. | |
| 46 | If successful, return the address of the string (this may be = RESULTBUF | |
| 47 | if no dynamic memory allocation was necessary) and set *LENGTHP to the | |
| 48 | number of resulting bytes, excluding the trailing NUL. Upon error, set | |
| 49 | errno and return NULL. | |
| 50 | ||
| 51 | When dynamic memory allocation occurs, the preallocated buffer is left | |
| 52 | alone (with possibly modified contents). This makes it possible to use | |
| 53 | a statically allocated or stack-allocated buffer, like this: | |
| 54 | ||
| 55 | char buf[100]; | |
| 56 | size_t len = sizeof (buf); | |
| 57 | char *output = vasnprintf (buf, &len, format, args); | |
| 58 | if (output == NULL) | |
| 59 | ... error handling ...; | |
| 60 | else | |
| 61 | { | |
| 62 | ... use the output string ...; | |
| 63 | if (output != buf) | |
| 64 | free (output); | |
| 65 | } | |
| 66 | */ | |
| 67 | #if REPLACE_VASNPRINTF | |
| 68 | # define asnprintf rpl_asnprintf | |
| 69 | # define vasnprintf rpl_vasnprintf | |
| 70 | #endif | |
| 71 | extern char * asnprintf (char *resultbuf, size_t *lengthp, const char *format, ...) | |
| 72 | __attribute__ ((__format__ (__printf__, 3, 4))); | |
| 73 | extern char * vasnprintf (char *resultbuf, size_t *lengthp, const char *format, va_list args) | |
| 74 | __attribute__ ((__format__ (__printf__, 3, 0))); | |
| 75 | ||
| 76 | #ifdef __cplusplus | |
| 77 | } | |
| 78 | #endif | |
| 79 | ||
| 80 | #endif /* _VASNPRINTF_H */ |